ITEM_TITLE      Flat field lamp (robotic)
ITEM_ANAME      fflamp
ITEM_REPORT	FFLAMP

		  <p>The flux of the robotic flat-field lamp is measured in a pattern
		      involving the L543.1 setup in every slit system. A single flat frame is measured.

		  <p>The lightpath between the lamp and the detector also includes interference
		      filters. Hence any effect observed in the efficiency trending could be due to either
		      the lamp or the filter.</p>

		  <p> The parameter giraffe_flat..flattype is either
ROB=robotic, or NAS=nasmyth. Here it is always ROB.

TITLE		QC1 parameters
TABLE_NAME	qc1_parameter
TABLE_TYPE      QC1_TABLE
TABLE_ROW1	[calculated by QC procedure]	SEP	giraffe_flat..flux

TITLE		Trending

	        Panels of the <a href="/qc/GIRAFFE/reports/HEALTH/trend_report_FFLAMP_HC.html" target="_blank"> trending
	            plot</a>:      

TABLE_NAME	boxes15
TABLE_TYPE      FIGURE_1B
TABLE_IMG1	"../img/fflamp1.gif" width="732" height="258" border="1"
TABLE_CAP1	<b>Boxes 1-5</b>: FF lamp efficiency. Data are from HC calibrations in the L543 setup, for all five fibre systems

	      <p>The lower panel shows the same data, plotted together, to reveal any
	          slit-specific effects. </p>

TABLE_NAME	box6
TABLE_TYPE      FIGURE_1
TABLE_IMG1	"../img/fflamp2.gif" width="180" height="201" border="1"
TABLE_CAP1	<b>Box 6</b>: Same data as above,  all fibre
TABLE_CAP1	              systems plotted together. In this plot, &quot;coherent&quot; changes in the signal can
TABLE_CAP1	              be best seen, indicative of a lamp problem, as opposed to changes in a single
TABLE_CAP1	              fibre system indicating a problem with that fibre system. 

	      <p>Plots of spectrally resolved relative fibre transmission can be found
	          <a href="/qc/ALL/ref_frames/FLAMES_GIRAFFE/html/giraffe_effic.html">here</a>. </p>

TITLE	Scoring&thresholds
	Upper thresholds both in the FFLAMP and the FFLEVEL reports are motivated by detecting saturation in the flat-fields.
	The flux value for saturation (for an exposure time fixed in the templates) depends on the setup
	(central wavelength) and can only loosely be defined in the HC settings. The lower threshold is set empirically 
	to detect lamp failures and compromised flat field quality resulting in insufficient SNR. <p>

	The QC1 values are averaged across the whole CCD and therefore include both illuminated regions (with the fibre signal) and 
	inter-fibre regions (without a signal). <p>


TITLE		History
TABLE_NAME	history
TABLE_TYPE	HISTORY
TABLE_ROW1	around 2007-10-01 	SEP	flux strongly decreased due to gripper problem; adjusted properly afterwards
TABLE_ROW2	around 2008-01-14	SEP	Low flux observed, due to bad positioning of the calibration mirror located inside of the OzPoz calibration unit
TABLE_END

TITLE 	Algorithm
	      The mean exposure level of the raw file across the whole file is measured (mean_raw) and then divided by the exposure time,
	      the result is the flux and comes in ADU/sec. For historical reasons the calculation is done by the QC procedure.